Comment 3 for bug 1436908

From UX point of view having a speaker icon on top of launcher icon doesn't really give much value to the user. It would just take away from our app icon designs and make the launcher more cluttered. There are already multiple possible indicators appearing on top of an icons (progress bar, count emblem) and this would be just one more. And it's not even very important one.

If you can come up with a very good use case when that information is crucial I'm of course willing to reconsider.